Magnetic and magneto-optical quenching in (Mn^2+, Sr^2+) metaphosphate glasses

Winterstein, A.; Akamatsu, Hirofumi; Möncke, Doris; Tanaka, Keiji; Schmidt, Markus A.; Wondraczek, Lothar

doi:10.1364/ome.3.000184

Cited by 40 publications

(37 citation statements)

References 25 publications

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“…Glasses containing high levels of paramagnetic ions which might be exploited for their magnetic, optically nonlinear or magneto-optical properties [1][2][3][4] are sought for applications such as fiber magnets, UV-NIR range optical diodes, switches, or isolators. 5,6 Therefore, the search for glass systems which accept such dopants in high quantities while retaining their optical quality and mechanical properties is a very important scientific challenge.…”

Section: Introductionmentioning

confidence: 99%

Partitioning and structural role of Mn and Fe ions in ionic sulfophosphate glasses

Möncke

Sirotkin

Stavrou

et al. 2014

The Journal of Chemical Physics

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Ionic sulfophosphate liquids of the type ZnO-Na2O-Na2SO4-P2O5 exhibit surprising glass forming ability, even at slow or moderate cooling rate. As a concept, they also provide high solubility of transition metal ions which could act as cross-linking sites between the sulfate and phosphate entities. It is therefore investigated how the replacement of ZnO by MnO and/or FeO affects the glass structure and the glass properties. Increasing manganese levels are found to result in a monotonic increase of the transition temperature Tg and most of the mechanical properties. This trend is attributed to the change of metal-ion coordination from four-fold around Zn(2+) to six-fold around Mn(2+) ions. The higher coordination facilitates cross-linking of the ionic structural entities and subsequently increases Tg. Raman and infrared spectroscopy show that the structure of these glasses involves only SO4(2-) and PO4 (3-) monomers as well as P2O7(4-) dimers. Replacement of ZnO by MnO is found to favour PO4(3-) over P2O7(4-) species, a trend which is enhanced by co-doping with FeO. Both transition metal ions show, like Zn(2+), a preference to selectively coordinate to phosphate anionic species, as opposed to sodium ions which coordinate mainly to sulfate anions. EPR spectroscopy finally shows that divalent Mn(2+) ions are present primarily in MnO6-clusters, which, in the studied sulfophosphate glasses, convert upon increasing MnO content from corner-sharing to edge-sharing entities.

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Section: Introductionmentioning

confidence: 99%

Partitioning and structural role of Mn and Fe ions in ionic sulfophosphate glasses

Möncke

Sirotkin

Stavrou

et al. 2014

The Journal of Chemical Physics

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“…Key for the design of an efficient, optically transparent (bulk) MO material is the incorporation of a high atom concentration of paramagnetic species while, at the same time, avoiding optical absorption to the highest possible degree. While some transition metals have also been considered for this purpose, at present, this calls for the use of rare earth species7. Here, due to the electronic transition of 4f 8 → 4f 7 5d89, the Tb 3+ ion offers one of the highest paramagnetic susceptibilities ( J = 6, g = 1.46) and magnetic moments (9.5–9.72 μ eff ) of all rare earth ions.…”

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confidence: 99%

Faraday rotation and photoluminescence in heavily Tb3+-doped GeO2-B2O3-Al2O3-Ga2O3 glasses for fiber-integrated magneto-optics

Gao

Winterstein-Beckmann

Surzhenko

et al. 2015

Sci Rep

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We report on the magneto-optical (MO) properties of heavily Tb3+-doped GeO2-B2O3-Al2O3-Ga2O3 glasses towards fiber-integrated paramagnetic MO devices. For a Tb3+ ion concentration of up to 9.7 × 1021 cm−3, the reported glass exhibits an absolute negative Faraday rotation of ~120 rad/T/m at 632.8 nm. The optimum spectral ratio between Verdet constant and light transmittance over the spectral window of 400–1500 nm is found for a Tb3+ concentration of ~6.5 × 1021 cm−3. For this glass, the crystallization stability, expressed as the difference between glass transition temperature and onset temperature of melt crystallization exceeds 100 K, which is a prerequisite for fiber drawing. In addition, a high activation energy of crystallization is achieved at this composition. Optical absorption occurs in the NUV and blue spectral region, accompanied by Tb3+ photoluminescence. In the heavily doped materials, a UV/blue-to-green photo-conversion gain of ~43% is achieved. The lifetime of photoluminescence is ~2.2 ms at a stimulated emission cross-section σem of ~1.1 × 10−21 cm2 for ~ 5.0 × 1021 cm−3 Tb3+. This results in an optical gain parameter σem*τ of ~2.5 × 10−24 cm2s, what could be of interest for implementation of a Tb3+ fiber laser.

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“…[ 164,165 ] This issue represents the motivation for investigating diamagnetic or paramagnetic glass systems with large Verdet constants which can be integrated into optical fi bers. [ 166 ] One of the key questions is how much of the bulk magnetooptic response can be maintained within the fi ber and what is the achievable Faraday rotation per absorption length, with the latter being the most important fi gure-of-merit parameter from the device perspective. [ 163 ] Adv.…”

Section: Optical Isolationmentioning

confidence: 99%

Hybrid Optical Fibers – An Innovative Platform for In‐Fiber Photonic Devices

Schmidt

Argyros

Sorin

2015

Advanced Optical Materials

164

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The field of hybrid optical fibers is one of the most active research areas in current fiber optics and has the vision of integrating sophisticated materials inside fibers, which are not traditionally used in fiber optics. Novel in‐fiber devices with unique properties have been developed, opening up new directions for fiber optics in fields of critical interest in modern research, such as biophotonics, environmental science, optoelectronics, metamaterials, remote sensing, medicine, or quantum optics. Here the recent progress in the field of hybrid optical fibers is reviewed from an application perspective, focusing on fiber‐integrated devices enabled by including novel materials inside polymer and glass fibers. The topics discussed range from nanowire‐based plasmonics and hyperlenses, to integrated semiconductor devices such as optoelectronic detectors, and intense light generation unlocked by highly nonlinear hybrid waveguides.

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Magnetic and magneto-optical quenching in (Mn^2+, Sr^2+) metaphosphate glasses

Cited by 40 publications

References 25 publications

Partitioning and structural role of Mn and Fe ions in ionic sulfophosphate glasses

Partitioning and structural role of Mn and Fe ions in ionic sulfophosphate glasses

Faraday rotation and photoluminescence in heavily Tb3+-doped GeO2-B2O3-Al2O3-Ga2O3 glasses for fiber-integrated magneto-optics

Hybrid Optical Fibers – An Innovative Platform for In‐Fiber Photonic Devices

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